http://www.scca.org/_filelibrary/File/2005SoloRules.pdf - Print pages 85-95 of this PDF.
http://www.scca.com/_FileLibrary/Fil...talclasses.pdf - this is the STS2 and STU supplement
Here's what I can see for STU:
1. All Stock category allowances, which includes front bar, shocks, after-cat exhaust, ss brake flex lines, factory camber bolts.
2. Body kits, dress up parts, frou frou unlimited. Some trim and spoilers can be omitted or changed.
3. Tires: Max. 275mm, 140 tread-wear min, wheels unlimited. AWD cars limited to 245mm.
4. Fenders may be rolled but not cut, so you have to be able to stuff that max. tire.
5. Driver/pass. seats can be racing style, 15 pounds (not including mounting hardware).
6. Any shocks/struts, even with "alternate mounting brackets".
7. Brakes: air ducts allowed, as are slotted/drilled. STX/STU: Brake backing plates can be modified. Drums can be replaced with discs. Calipers are free (must attach to original points), as are the discs of ferrous or aluminum construction (2-piece lightweight rotors) of the same size or larger than the stock equipment.
8. Open anti-sway bars, springs, perches, bump stops, camber plates, 2-point strut bars (f and r) and coil-overs.
9. Bushings are free (except metal) including offset.
10. Open panhard bars, torque arms or traction bars - can be added.
11. "Camber Kits" may be installed. These include longer/adj. length control arms??? Wow! Camber. Only upper or lower arms can be replaced, not both.
12. Relocated and smaller batteries can be used.
13. Traction control systems can be "electrically disabled", but not removed or altered. (doh! sucks to be hanchey)
14. Throttle body forward air intake is free. On turbos, it's compressor inlet forward.
15. Open exhaust headers/manifolds, as long as they are "emissions legal".
16. Engine management may be altered except for boost levels. Must meet 49-state tailpipe emission test.
17. Open shifter, linkages, pulleys, crank damper.
18. For STU cars that are RWD, any aftermarket LSD may be fitted.
19. High flow cats may be used but the inlet must be "within 6" of the factory location". Number of cats can be changed.
Sample of Eligible STU cars:
Audi S4, E36 M3, Camaro/Firebird, GTO, Mustang, RX-8, Lancer Evo, WRX STi, Volvo S60 R, Toyota Supra.
"Sample" Excluded STU cars:
E46 M3, E39 M5
One thing to note: STX allows up to 5.1L N.A., so a new Mustang GT would be eligible... but the weight is the killer.
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